Question

Помогите с примерами по алгебре, пожалуйста. Даю 60 баллов

Answer 1

Объяснение:

3.

а) $sqrt{25a} + sqrt{36a}+sqrt{49a} = 5sqrt{a}+6sqrt{a}+7sqrt{a} = 18sqrt{a}$

б) $(6-sqrt{5})(2+7sqrt{5}) = 12+42sqrt{5}-2sqrt{5}-35 = 40sqrt{5}-23$

в) $(5-sqrt{2})^{2}+(3+sqrt{2})^{2} = 25-10sqrt{2}+2+9+6sqrt{2}+2 = 38-4sqrt{2}$

4.

а) $frac{x^{2}-11}{x+sqrt{11}} = frac{(x-sqrt{11})(x+sqrt{11})}{x+sqrt{11}} = x-sqrt{11}$

б) $frac{sqrt{x}-12}{x-144} = frac{sqrt{x}-12}{(sqrt{x}-12)(sqrt{x}+12)} = frac{1}{sqrt{x}+12}$

в) $frac{17-sqrt{17}}{sqrt{17}} = frac{sqrt{17}(sqrt{17}-1)}{sqrt{17}} = sqrt{17}-1$